chore: add pnpm workspace configuration for apps and packages

.devcontainer/Dockerfile

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+FROM mcr.microsoft.com/devcontainers/typescript-node:24
+
+# Install additional tools
+RUN apt-get update && apt-get install -y \
+    postgresql-client \
+    redis-tools \
+    && rm -rf /var/lib/apt/lists/*
+
+# Set up pnpm environment
+ENV PNPM_HOME=/home/node/.local/share/pnpm
+ENV PATH=$PNPM_HOME:$PATH
+
+USER node
+
+# Set working directory
+WORKDIR /workspace
+
+# Install global packages
+RUN pnpm install -g @nestjs/cli@latest
+

.devcontainer/devcontainer.json

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+{
+  "name": "DreamChat Development",
+  "dockerComposeFile": "docker-compose.yml",
+  "service": "app",
+  "workspaceFolder": "/workspace",
+  "features": {
+    "ghcr.io/devcontainers/features/node:1": {
+      "version": "24"
+    },
+    "ghcr.io/devcontainers/features/docker-in-docker:2": {
+      "moby": false
+    }
+  },
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "dbaeumer.vscode-eslint",
+        "esbenp.prettier-vscode",
+        "bradlc.vscode-tailwindcss",
+        "ms-vscode.vscode-typescript-next",
+        "nestjs.vscode-nestjs",
+        "prisma.prisma"
+      ],
+      "settings": {
+        "editor.formatOnSave": true,
+        "editor.defaultFormatter": "esbenp.prettier-vscode",
+        "typescript.preferences.importModuleSpecifier": "relative"
+      }
+    }
+  },
+  "forwardPorts": [3000, 5173, 5432],
+  "portsAttributes": {
+    "3000": {
+      "label": "Backend API",
+      "onAutoForward": "notify"
+    },
+    "5173": {
+      "label": "Frontend Dev Server",
+      "onAutoForward": "notify"
+    },
+    "5432": {
+      "label": "PostgreSQL",
+      "onAutoForward": "silent"
+    }
+  },
+  "postCreateCommand": "bash .devcontainer/post-create.sh",
+  "remoteUser": "node",
+  "mounts": [
+    "source=${localWorkspaceFolderBasename}-node_modules,target=${containerWorkspaceFolder}/node_modules,type=volume",
+    "source=${localWorkspaceFolderBasename}-pnpm-store,target=/home/node/.local/share/pnpm/store,type=volume"
+  ]
+}

.devcontainer/docker-compose.yml

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+services:
+  app:
+    build:
+      context: ..
+      dockerfile: .devcontainer/Dockerfile
+    volumes:
+      - ..:/workspace:cached
+      - /var/run/docker.sock:/var/run/docker.sock
+    command: sleep infinity
+    environment:
+      - DATABASE_URL=postgresql://postgres:postgres@db:5432/dreamchat
+      - REDIS_URL=redis://redis:6379
+      # Keycloak is external - configure KEYCLOAK_URL in apps/backend/.env
+    depends_on:
+      - db
+      - redis
+    networks:
+      - dreamchat-network
+
+  db:
+    image: ankane/pgvector:latest
+    restart: unless-stopped
+    environment:
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: postgres
+      POSTGRES_DB: dreamchat
+    volumes:
+      - postgres-data:/var/lib/postgresql/data
+    ports:
+      - "5432:5432"
+    networks:
+      - dreamchat-network
+
+  redis:
+    image: redis:7-alpine
+    restart: unless-stopped
+    ports:
+      - "6379:6379"
+    networks:
+      - dreamchat-network
+
+volumes:
+  postgres-data:
+
+networks:
+  dreamchat-network:
+    driver: bridge

.devcontainer/post-create.sh

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+#!/bin/bash
+set -e
+
+echo "🚀 Setting up DreamChat monorepo development environment..."
+
+# Install all dependencies (uses pnpm workspaces)
+echo "📦 Installing dependencies..."
+cd /workspace
+pnpm install
+
+# Build shared packages first
+echo "📦 Building shared packages..."
+pnpm --filter @dreamchat/shared build || echo "Shared package build skipped (may not exist yet)"
+
+# Generate Prisma client
+echo "🔧 Generating Prisma client..."
+cd /workspace/apps/backend
+pnpm db:generate || echo "Prisma generate skipped (may not be set up yet)"
+cd -
+
+# Copy environment files if they don't exist
+if [ ! -f /workspace/apps/backend/.env ]; then
+    echo "⚙️  Creating backend .env file..."
+    mkdir -p /workspace/apps/backend
+    cat > /workspace/apps/backend/.env << EOF
+NODE_ENV=development
+PORT=3000
+DATABASE_URL=postgresql://postgres:postgres@db:5432/dreamchat
+JWT_SECRET=dev-jwt-secret-change-in-production
+JWT_EXPIRES_IN=1h
+JWT_REFRESH_EXPIRES_IN=7d
+LLM_PROVIDER=openrouter
+LLM_API_KEY=your-openrouter-api-key
+LLM_MODEL=openai/gpt-4o
+
+# Keycloak (external) - configure if using external Keycloak
+KEYCLOAK_ENABLED=false
+# KEYCLOAK_URL=http://your-keycloak-server:8080
+# KEYCLOAK_REALM=dreamchat
+# KEYCLOAK_CLIENT_ID=dreamchat-backend
+# KEYCLOAK_CLIENT_SECRET=your_keycloak_secret
+
+# Keycloak Authorization (optional)
+# KEYCLOAK_REQUIRED_GROUP=dreamchat-users
+# KEYCLOAK_REQUIRED_ROLE=dreamchat-access
+# KEYCLOAK_REQUIRED_CLIENT_ROLE=user
+# KEYCLOAK_REQUIRED_ATTRIBUTE=approved:true
+
+# Keycloak Auto-Create Users
+KEYCLOAK_AUTO_CREATE_USER=true
+KEYCLOAK_DEFAULT_USER_ROLE=USER
+EOF
+fi
+
+if [ ! -f /workspace/apps/frontend/.env ]; then
+    echo "⚙️  Creating frontend .env file..."
+    mkdir -p /workspace/apps/frontend
+    cat > /workspace/apps/frontend/.env << EOF
+VITE_API_URL=http://localhost:3000/api
+VITE_WS_URL=ws://localhost:3000
+# Keycloak (external) - configure if using external Keycloak
+# VITE_KEYCLOAK_URL=http://your-keycloak-server:8080
+# VITE_KEYCLOAK_REALM=dreamchat
+# VITE_KEYCLOAK_CLIENT_ID=dreamchat-frontend
+EOF
+fi
+
+echo "✅ Development environment setup complete!"
+echo ""
+echo "Next steps:"
+echo "1. Start all apps: pnpm dev"
+echo "2. Or start individually:"
+echo "   - Backend: pnpm --filter @dreamchat/backend dev"
+echo "   - Frontend: pnpm --filter @dreamchat/frontend dev"
+echo ""
+echo "Note: Keycloak is external. Configure KEYCLOAK_URL in apps/backend/.env if needed."